By ecosystem

This section lists the flora of Atys as it appears to the laymen homin. Note that many of this 'flora' isn't even really plants, but actually fungi or even immobile animals. But you'd have to dabble in botany a bit before you realise this.

The flora you may run into varies immensely based on the ecosystem of the continent you're in. Only a few plants appear in multiple ecosystems (like the Olansi tree that appears in both desert and lakelands). Thus the flora is classified by ecosystem.